package cn.zhouchao.async;

import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.common.message.MessageExt;
import java.nio.charset.StandardCharsets;
import java.util.List;

/**
 * 消费者
 */
public class AsyncConsumer {
    public static void main(String[] args) throws InterruptedException, MQClientException {

        // 1.创建一个消费者对象
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("sync_consumer_group");

        // 2.设置NameServer的地址
        consumer.setNamesrvAddr("localhost:9876");

        // 3.订阅一个或者多个Topic，以及Tag来过滤需要消费的消息
        consumer.subscribe("async_topic", "async_tag");



        // 4.往消费者中设置我们的监听事件，编写怎么取处理消息
        consumer.registerMessageListener(new MessageListenerConcurrently() {
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs, ConsumeConcurrentlyContext context) {
                try {
                    msgs.forEach(e->{
                        System.out.println(new String(e.getBody(), StandardCharsets.UTF_8));
                    });
                    // 标记该消息已经被成功消费
                    return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
                } catch (Exception e) {
                    e.printStackTrace();
                    // 消费异常，我们告诉mq重新发送消息
                    return ConsumeConcurrentlyStatus.RECONSUME_LATER;
                }
            }
        });

        // 5.启动消费者实例
        consumer.start();

        System.out.printf("Consumer Started.%n");
    }
}
